Magnetic Susceptibility Application: A Window onto Ancient Environments and Climatic Variations
Magnetic susceptibility (MS) is a tool frequently used by geologists on sediments or rocks to perform correlations and sea-level or climatic reconstructions. Applied measurements are made on unoriented, bulk samples and bulk MS is mostly influenced by the magnetic mineral content of the rock and often interpreted as influenced by detrital inputs. Magnetic data acquisition is fast and straightforward and this allows the high-resolution sampling needed for palaeoclimatic research (e.g. spectral analysis). However, the link with detrital inputs is not always preserved and the impact of diagenesis on the final MS signal can blur primary information. This volume includes contributions dealing with the origin of the magnetic minerals, and the application of MS as a palaeoenvironmental or palaeoclimatic proxy and also as a tool to provide astronomical calibration in order to improve the chronology of selected time intervals.
Magnetic susceptibility and facies relationship in Bajocian–Bathonian carbonates from the Azé caves, southeastern Paris Basin, France
Published:January 01, 2015
S. DeChamps, A. C. Da Silva, F. Boulvain, 2015. "Magnetic susceptibility and facies relationship in Bajocian–Bathonian carbonates from the Azé caves, southeastern Paris Basin, France", Magnetic Susceptibility Application: A Window onto Ancient Environments and Climatic Variations, A. C. Da Silva, M. T. Whalen, J. Hladil, L. Chadimova, D. Chen, S. Spassov, F. Boulvain, X. Devleeschouwer
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This study focuses on three Bajocian and Bathonian carbonate sections from the southeastern part of the Paris Basin (Mâconnais area, in the east of France). The main goals of the study are to propose a palaeoenvironmental model, to get insight into vertical and lateral facies evolution, to improve correlations and to better understand the origin of the magnetic susceptibility (MS) signal in these deposits. The sedimentological setting corresponds to a ramp, with two types of geometries: (1) a homoclinal carbonate ramp with oolitic shoals; and (2) a multiple-slopes carbonate ramp with reef complexes. The MS signal appears to be...